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"Azar" is a noun which is often translated as "chance", and "suerte" is a noun which is often translated as "luck". Learn more about the difference between "azar" and "suerte" below.
el azar()
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
la suerte()
A feminine noun is almost always used with feminine articles and adjectives (e.g., la mujer bonita, la luna llena).